Applying antifouling paint to an HDPE (High-Density Polyethylene) boat requires a specialized primer system, as conventional marine paints do not adhere properly to the inherently low-friction surface of HDPE. The key is to use a specific bonding primer designed for poly plastics, followed by a compatible antifouling paint. Recommended Primer: You will need a specialized primer designed specifically for polyethylene surfaces to ensure proper adhesion. Standard marine primers for fiberglass or wood are not sufficient. PaintFlex® for HDPE: This product is specifically designed to adhere to all types of HDPE without needing flame or corona treatments. It creates a binding layer that allows standard antifouling paints to be applied on top. Alternatively 3M™ Tape Primer 94 can be used to improve the overall adhesion to polyethylene) We use this product on gluing the seat cushions) Specific paint options like Pettit Hydrocoat or Polymarine’s SP54 are designed for plastic hulls.